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1. I'm unsure of whether these questions and answers are correct

Calculate the amount of solute in the following:

2a) 4.00dm^3 of 5.00mol/dm^-3 NaOH

4.00 x 5.00 = 20mol/dm3

2b) 1.00dm^3 of 2.50mol/dm^-3 HCl

1.00 x 2.50 = 2.5mol/dm3

Calculate the mass of solute in the following:

3a) 1.00dm^3 of 0.100mol/dm^-3 NaCl
(I was unsure of this one so I didn't do it)

3b) 500cm^3 of 1.00mol/dm^-3 CaCl2

500 / 1000 = 0.5dm^3

111.1 / 0.5 = 222.2g/dm^3

3c) 250cm^3 of 0.200mol/dm^3

250 / 1000 = 0.25dm^3

158 / 0.25 = 632g/dm^3
2. (Original post by iNicole14)
I'm unsure of whether these questions and answers are correct

Calculate the amount of solute in the following:

2a) 4.00dm^3 of 5.00mol/dm^-3 NaOH

4.00 x 5.00 = 20mol/dm3

2b) 1.00dm^3 of 2.50mol/dm^-3 HCl

1.00 x 2.50 = 2.5mol/dm3

Calculate the mass of solute in the following:

3a) 1.00dm^3 of 0.100mol/dm^-3 NaCl
(I was unsure of this one so I didn't do it)

3b) 500cm^3 of 1.00mol/dm^-3 CaCl2

500 / 1000 = 0.5dm^3

111.1 / 0.5 = 222.2g/dm^3

3c) 250cm^3 of 0.200mol/dm^3

250 / 1000 = 0.25dm^3

158 / 0.25 = 632g/dm^3
I am sure that the questions are correct.

Take care that the units are correct in the answer and correspond to the concept asked for.

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